Cosham (/ˈkɒʃəm/ or /ˈkɒsəm/)[2] is a northern suburb of Portsmouth lying within the city boundary but off Portsea Island, in the ceremonial county of Hampshire, England.

It is mentioned in the Domesday Book of 1086[3] along with Drayton and Wymering (mainland) and Bocheland (Buckland), Frodington (Fratton) and Copenore (Copnor) on the island.

In later centuries, extensive suburban growth expanded around the village and both east and west along the slopes of Portsdown Hill.

Locally referred to as simply QA, it is the major hospital for the south-east Hampshire and south-west West Sussex area.

Cosham railway station provides frequent services by 3 train companies to destinations including; Brighton, London Waterloo, ]Bristol, Cardiff & Southampton.